This patch implements & tests the LU solver. It uses LAPACK to perform
the actual work.
More work went into writing the tests than the actual code! I found a
nice on-line book on "Numerical Computing in Matlab" by Cleve Moler (the
MATLAB founder) that I cribbed the residual error bound from. I put a
link to the book on the VSIPL++ resource wiki.
-- Jules
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